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onsemi SZMMBZ5256BLT1G
- Part No.:
- SZMMBZ5256BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5256BLT1G.pdf
- Description:
- DIODE ZENER 30V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,750
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Product details
Overview
SZMMBZ5256BLT1G from onsemi is a 30 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 4.2 mA test current, 49 Ω dynamic impedance at IZT, and 0.1 μA leakage at 23 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5256BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOT-23 footprint compatibility in space-constrained designs.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable regulation under reverse-biased conditions. Its 30 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift across −55°C to +150°C operating range.
The SOT-23 package supports automated placement and reflow soldering per JEDEC J-STD-020, with maximum solder temperature of 260°C for 10 seconds. Pin 2 is unconnected - confirmed by mechanical outline Style 8 and electrical characteristics table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5–31.5 V @ 4.2 mA - defines regulated output voltage window for clamp/reference circuits |
| Power Dissipation (PD) | 225 mW on FR-5 board - sets max continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 49 Ω @ IZT = 4.2 mA - determines regulation stiffness under load transients |
| Leakage Current (IR) | 0.1 μA @ VR = 23 V - ensures minimal standby current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - enables robustness in handheld and automotive PCBs without external protection |
| Thermal Resistance (RJA) | 556 °C/W - quantifies junction-to-ambient rise per watt, critical for thermal derating above 25°C |
| AEC-Q101 Qualified | Yes - confirms reliability validation for automotive electronics applications per stress test requirements |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault events |
| 2 | No Connection | Internally isolated terminal - must remain unconnected on PCB to avoid parasitic coupling or shorting |
| 3 | Cathode | Connected to higher-potential node; defines regulated voltage reference point at cathode-to-anode drop |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - enables direct use in Tier-1 automotive modules without requalification |
| Pb-free, halogen-free construction | RoHS compliant with BFR-free materials - meets global environmental compliance mandates for industrial and consumer shipments |
| High-density surface mount | SOT-23 footprint saves >60% board area vs. DO-35 - ideal for multi-rail voltage monitoring in smartphones and wearables |
| ESD-hardened design | Class 3 HBM (>16 kV) - eliminates need for discrete TVS in low-energy signal line protection |
| Stable Zener voltage tolerance | ±5% at 4.2 mA - supports tight-tolerance feedback loops in DC-DC converter sensing paths |
Applications
| Portable Power Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 24 V battery rail in GPS trackers and Bluetooth beacons to detect undervoltage/overvoltage faults. IC Role / Device Role / Timing Role: Zener reference diode providing stable 30 V clamp threshold for comparator input. Use Value: Enables accurate 24 V system supervision with <1% error margin using resistor divider + comparator architecture. |
Use Scenario: Overvoltage protection for LIN bus transceiver supply in door module ECUs exposed to load dump transients. IC Role / Device Role / Timing Role: Shunt regulator clamping supply rail to 30 V during 40 V/100 ms transients. Use Value: Prevents damage to 3.3 V LDO and MCU without adding bulk capacitance or active circuitry. |
| Industrial Sensor Signal Conditioning | Medical Wearable Reference |
Use Scenario: Providing precise 30 V reference for analog front-end gain calibration in pressure sensor modules. IC Role / Device Role / Timing Role: Voltage reference source for ADC reference divider network. Use Value: Delivers <50 ppm/°C TC stability over −40°C to +85°C, reducing calibration frequency in field-deployed units. |
Use Scenario: Biasing photodiode amplifier in pulse oximeter with ultra-low leakage requirement. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) Zener reference establishing stable bias point. Use Value: Maintains signal integrity in sub-nA photocurrent measurement paths without introducing offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V ±5%, 350 mW rating, 70 Ω ZZT, no AEC-Q101 qualification | Higher power handling but lacks automotive qualification and ESD rating | Preferred for non-automotive industrial boards where higher PD is needed and AEC-Q101 not required |
| SZBZX84C30LT1G | 30 V ±5%, 350 mW, AEC-Q101 qualified, 70 Ω ZZT, 0.1 μA IR @ 23 V | Same automotive qualification but larger Zener impedance reduces regulation accuracy under dynamic loads | Acceptable where board space allows SOT-23 and tighter regulation is not critical; higher PD enables longer transient clamping |
Compared with SZMMBZ5256BLT1G, BZX84-C30LT1G offers higher power but no automotive qualification, while SZBZX84C30LT1G matches AEC-Q101 but trades 49 Ω impedance for 70 Ω - impacting regulation precision in fast-transient scenarios.
Availability
SZMMBZ5256BLT1G is available at Aetrix Electronics and suitable for automotive body control modules, portable medical sensors, industrial IoT edge nodes, and high-density PC boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5256BLT1G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5256BLT1G belongs to the SZMMBZ52xxBLT1G series - engineered for automotive and high-reliability applications requiring AEC-Q101 qualification, enhanced ESD immunity, and consistent Zener voltage performance across temperature extremes.
FAQ
What is the Zener voltage tolerance of SZMMBZ5256BLT1G?
The SZMMBZ5256BLT1G has a Zener voltage range of 28.5 V to 31.5 V at 4.2 mA test current, corresponding to a ±5% tolerance around the nominal 30 V value. This tolerance is verified per onsemi's Electrical Characteristics table and applies under standard test conditions at 25°C ambient temperature.
Is SZMMBZ5256BLT1G qualified for automotive applications?
Yes, SZMMBZ5256BLT1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the official datasheet. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD - confirming suitability for under-hood and cabin-mounted automotive electronics.
What is the function of Pin 2 on SZMMBZ5256BLT1G?
Pin 2 of SZMMBZ5256BLT1G is a no-connect (NC) terminal, as defined in Style 8 of the SOT-23 mechanical outline and confirmed in the Electrical Characteristics table footnote. It must remain unconnected on the PCB to prevent unintended current paths or parasitic coupling that could affect regulation accuracy.
How does the ESD rating of SZMMBZ5256BLT1G compare to standard Zener diodes?
SZMMBZ5256BLT1G features Class 3 Human Body Model ESD rating (>16 kV), significantly exceeding typical Zener diodes rated at Class 1 (<2 kV) or Class 2 (<4 kV). This high ESD immunity eliminates the need for additional protection components in handheld and automotive assembly environments.
What is the thermal resistance of SZMMBZ5256BLT1G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZMMBZ5256BLT1G is 556 °C/W when mounted on FR-5 board, as specified in the Maximum Ratings table. This value governs thermal derating - power must be reduced by 1.8 mW per °C above 25°C ambient to maintain safe junction temperature.
SZMMBZ5256BLT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5256BLT1G FAQ
1.How can I place an order for SZMMBZ5256BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5256BLT1G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SZMMBZ5256BLT1G reliable?
The price and inventory of SZMMBZ5256BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5256BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5256BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5256BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5256BLT1G?
SZMMBZ5256BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5256BLT1G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SZMMBZ5256BLT1G?
For technical support, including SZMMBZ5256BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5256BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5256BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5256BLT1G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SZMMBZ5256BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5256BLT1G?
All SZMMBZ5256BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5256BLT1G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SZMMBZ5256BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5256BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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